Universe Sandbox Alternatives

Celestia - real-time 3D visualization of space.

Stellarium is a free open source planetarium for your computer.

Space Engine is a realistic virtual Universe you can explore on your computer.

Build spacecraft, fly them, and try to help the Kerbals to fulfill their ultimate mission of conquering space.

Player-created empires, player-driven markets, and endless ways to embark on your personal sci-fi adventure.

1, 966, 341. Active citizen. Help us make Star Citizen a reality! Become a backer of the next-generation of Space-man. Reserve your ship.

3D model of the Solar System and night sky in real time

Sins of a Solar Empire is an Adventure, Strategy, Real-time-strategy, Science-fiction, Exploration, Aliens, Single and Multiplayer Space Simulation developed by Ironclad Games and published by Stardock.

Star Conflict is a free MMO action game and space simulator that was introduced in 2012.

Pioneer is a space adventure game set in the Milky Way galaxy at the turn of the 31st century.

The space-based MMO Vendetta Online balances an online trading system with tense ship-to=ship combat.

Orbiter is a realistic 3D real-time space flight simulator program. Official site with free download. DownloadDownload mirror 1 Europe - Textures - Gallery - Links - .

KStars is a Desktop Planetarium for KDE.